Down with metric!

#include <chrono>
#include <iostream>

typedef std::chrono::duration<long long, std::ratio<1,          60>> thirds;
typedef std::chrono::duration<long long, std::ratio<1,        3600>> fourths;
typedef std::chrono::duration<long long, std::ratio<1,      216000>> fifths;
typedef std::chrono::duration<long long, std::ratio<1,    12960000>> sixths;
typedef std::chrono::duration<long long, std::ratio<1,   777600000>> sevenths;
typedef std::chrono::duration<long long, std::ratio<1, 46656000000>> eighths;

constexpr std::chrono::hours operator"" _hours(unsigned long long h)
{
    return std::chrono::hours(static_cast<std::chrono::hours::rep>(h));
}

constexpr std::chrono::minutes operator"" _minutes(unsigned long long m)
{
    return std::chrono::minutes(static_cast<std::chrono::minutes::rep>(m));
}

constexpr std::chrono::seconds operator"" _seconds(unsigned long long s)
{
    return std::chrono::seconds(static_cast<std::chrono::seconds::rep>(s));
}

constexpr thirds operator"" _thirds(unsigned long long t)
{
    return thirds(static_cast<thirds::rep>(t));
}

constexpr fourths operator"" _fourths(unsigned long long f)
{
    return fourths(static_cast<fourths::rep>(f));
}

constexpr fifths operator"" _fifths(unsigned long long f)
{
    return fifths(static_cast<fifths::rep>(f));
}

constexpr sixths operator"" _sixths(unsigned long long s)
{
    return sixths(static_cast<sixths::rep>(s));
}

constexpr sevenths operator"" _sevenths(unsigned long long s)
{
    return sevenths(static_cast<sevenths::rep>(s));
}

constexpr eighths operator"" _eighths(unsigned long long e)
{
    return eighths(static_cast<eighths::rep>(e));
}

int main()
{
    std::cout << "1 second is " << std::chrono::duration_cast<thirds>(1_seconds).count() << " thirds.\n";
    std::cout << "1 third is " << std::chrono::duration_cast<fourths>(1_thirds).count() << " fourths.\n";
    std::cout << "1 fourth is " << std::chrono::duration_cast<fifths>(1_fourths).count() << " fifths.\n";
    std::cout << "1 fifth is " << std::chrono::duration_cast<sixths>(1_fifths).count() << " sixths.\n";
    std::cout << "1 sixth is " << std::chrono::duration_cast<sevenths>(1_sixths).count() << " sevenths.\n";
    std::cout << "1 seventh is " << std::chrono::duration_cast<eighths>(1_sevenths).count() << " eighths.\n";
    std::cout << "1 second is " << std::chrono::duration_cast<fifths>(1_seconds).count() << " fifths.\n";

    std::cout << "3 fifths is " << std::chrono::duration_cast<std::chrono::nanoseconds>(3_fifths).count() << " nanoseconds.\n";

    return 0;
}